Toilets that, instead of using around 6 liters of water per flush, use about 2 or 3 liters per flush (lpf). This can result in even the smallest, softest piece of shit clogging the entire toilet, which can then result in unwanted calls for the plumber, and having to buy a jumbo toilet plunger to take care of your problem once and for all.

Generally, it's a very bad toilet. But hey, at least hippy Bob can stop bitching about people wasting water on one flush, even though now the average person must flush three times as much on a low flow toilet to get anything to go down.